feat: checkout correct branch on close (#1123)

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

- **Chores**
- Refined our deployment process to ensure staging updates now reflect
the fully merged changes.
	- Made minor formatting tweaks for improved clarity.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

.github/workflows/push-staging-pr-on-close.yml

@@ -18,6 +18,8 @@ jobs:
           timezoneLinux: "America/Los_Angeles"
       - name: Checkout repo
         uses: actions/checkout@v4
+        with:
+          ref: refs/pull/${{ github.event.pull_request.number }}/merge
 
       - name: Download artifact
         uses: actions/download-artifact@v4
@@ -31,7 +33,7 @@ jobs:
             echo "ERROR: dynamix.unraid.net.pr.plg not found"
             exit 1
           fi
-          
+
           plgfile="connect-files/plugins/dynamix.unraid.net.pr.plg"
           version=$(date +"%Y.%m.%d.%H%M")
           sed -i -E "s#(<!ENTITY version \").*(\">)#\1${version}\2#g" "${plgfile}" || exit 1